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Found one definition

1.                 From The Collaborative International Dictionary of English v.0.48:
                   
   
   
                   
                     
   Taction \Tac"tion\, n. [L. tactio, from tangere, tactum, to
      touch.]
      The act of touching; touch; contact; tangency. "External
      taction." --Chesterfield.
      [1913 Webster]